Harmonic signaling device for telephone systems.



W. W. DEAN. HARMONIG SIGNALING DEVICE FOR TELEPHONE SYSTEMS.

APPLICATION FILED SEPT. 9, 1905.

Patented Jan. 19, 1915.

THE NORRIS PETERS Tu'utHO" WASHINGION, D. c.

EJNTTE STATS} PATET FFTQE.

WILLIAM W. DEAN, OF ELYRIA, OHIO; CURTIS B. CAMP, TRUSTEE, APPOINTED BY COURT.

HARMONIC SIGNALING DEVICE FDR TELEPHONE SYSTEMS.

Specification of Letters Patent.

Patented Jan. in, 1915.

Application filed September 9, 1995. Serial No. 277,687.

. of Ohio, have invented certain new and useful Improvements in Harmonic Signaling Devices for Telephone Systems, of which the followingis a specification, reference being had therein to the accompanying drawing.

My invention relates to selective signaling systems, and particularly to receiving devices for use therein. r

It has for its object the improvement and simplification of such devices.

Specifically stated my invention comprises a polarized selective ringer for harmonic signaling. In such ringers as I have heretofore disclosed them the structure is similar to that of an ordinary polarized bell except that the armature instead of being pivoted is mounted upon a stifi spring secured by its ends so that the resilience of the spring permitsmovement of the armature and re-acts in such fashion as to supplement the efiects of the current. Each ringer made according to my present invention has a definite period, and will respond to current of a definite frequency only. I attain this result by suitably proportioning the three constants of length, mass and'tension. of the clapper-rod and connected parts. In the present case I provide the armature with a simple form of pivot support. and connect a stiff spring therewith, providing adjustments for the latter such that the armature may be exactly placed and its motion accurately determined. The tension of my spring is also made vadiustable,which I consider an important feature.

My invention is illustrated in the accompanving drawings wherein:

Figure 1 is a top plan view as mounted of a ringer with my improvements; Fig. 2 is a side view'thereof; Fig. 3 is a rear end view thereof; and Figs. 4 and 5 are respectively top plan and rear end views of modified armature connections.

Referring to the drawings A indicates a pair of spools mounted upon soft iron cores carried by the iron yoke B, which also carries the gongs Gr, mounted on posts g which may be adiusted to and from the center of the yoke by means of the worms 6. The yoke also carries the permanent magnet M carried upon the magnet head.

by which the armature and cores are normally polarized.

Carried upon the rear end of the cores of the magnets A is a brass yoke Y, secured by lock nuts y, which may be threaded either directly on the pole piece or upon the sleeve The yoke has its ends provided with lateral tongues 3/, which are bent back and returned in a plane parallel to that of the main body of the: yoke. The armature A is mounted directly opposite the pole pieces, and provided with astiff spring a screwed or riveted toit,

whose op osite ends extend past the bent tongues of the yoke, and rest upon the points of set screws 3 which are tapped therein. This arrangement is particularly shown in Figs. 1, 2 and 3. Since the spring is not rigidly fastened to the yoke spring it is necessary to provide independent means for supporting the armature, so I produce a simple form of pivot support by dropping two studs 1 from the body of the yoke Y, each stud having a. slight depression in its end, and receiving the pointed tip of a screw e tapped up through the armature and held by a suitable lock-nut. The downward pressure of the two ends of the spring a against the screws 2 throws the armature forward so as to hold the screws 7 permanently in engagement with the studs 1 and as the armature is vibrated by the magnets it rocks upon the studs against the tension one way or the other of the spring a.

In Figs. 4- and 5 I have shown a modified form of pivot support, with a corresponding modification in the spring a. Here the yoke Y has dropped ends 3 carrying screws g as before; but the screws point downward, and the spring a presses upward, in a fashion the reverse of that shown in Figs. 1, 2 and 3. The consequent downward pull on the armature necessitates a pivot, hence in this case I employ a pair of drop ears y with pivot point and screw as seen in ordinary ringers. The adjustmentand operation of this device are the same as those of the other.

It is to be noted that the present improvements are of such a nature that they can readily be applied to ordinary ringers of my standard tvpe, having a yoke carried on the ends of the cores, all that is necessary being to substitute the new yokes, armatures and clapper-rods, for the old ones.

Having thus described my invention What I claim and desire to secure by Letters Patent is:

1. I11 a selective harmonic ringer, an electro-magnet, a pivoted armature, and a spring normally maintaining the armature in an intermediate position, said spring having its major axis lying parallel to that of the armature, and means to adjust the tension thereof, substantially as described.

2. In a selective harmonic ringer, an elec tro-magnet, a pivoted armature, and a spring normally maintaining the armature in an intermediate position, an intermediate point of said spring secured to the armature and the ends of said spring resting against supports, substantially as described.

3. In a selective harmonic ringer, an electro-magnet, a pivoted armature, and a spring normally maintaining the armature in an intermediate position, the middle of said spring secured to the armature and the Copies of this patent may be obtained for ends of said spring adjustably supported, whereby its tension may be changed and the armature adjusted at will, substantially as described.

4-. A harmonic selective signal device comprising a double electro-magnet, a carrying yoke therefor, a pair of gongs adjustably mounted thereon, a polarizing magnet, an armature yoke carried upon the free ends of the magnet cores, a pivotal connection between the yoke and the armature, and a tension spring secured at an intermediate point to the armature, together With adjustable supports in the yoke for the ends of the ten sion spring, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

WILLIAM W. DEAN.

Witnesses:

RAY H. MANSON,

A. BEYLAND.

five cents each, by addressing the Commissioner of'latents,

Washington, D. G. 

